Terminal Connections - DSC PC2550 Installation Manual

Terminal Connections

"AC" Power Terminals
Use a 16.5 VAC transformer with a minimum 40 VA rating to
supply AC power to the PC2550. The transformer should not
be connected to an outlet that is controlled by a switch. If
AC failure occurs it is displayed as a trouble on the keypad
(see "Keypad Functions [ ][2] Trouble Conditions"). It can
also be transmitted to the monitoring station as a trouble
condition (see "Programming Guide [ ][8]" sections [12]
and [13] for alarm and restore codes and section [20] for
AC transmission delay).
Auxiliary Power Terminals "AUX" and "GND"
The auxiliary power supply can be used to power motion
detectors and other devices requiring 12 V
is available from the "AUX" (positive) and "GND" (negative)
terminals when the PC2550 is used with one keypad. For
each additional keypad the auxiliary supply rating must be
reduced by 60 mA. The auxiliary supply is fused with the
keypad supply at 1 amp. Auxiliary fuse failure transmission
can be sent (see [ ][8] sections [12] and [13]).
Switched Auxiliary Power Terminals
"SW AUX" and "GND"
The switched auxiliary supply can be switched off
momentarily from the keypad (see "Keypad Commands
[ ][4]"). The "SW AUX" terminal is positive and the "GND"
terminal negative. The 400 mA auxiliary supply rating must
be reduced by any current taken from the switched auxiliary
supply. The switched supply shares the same fuse as the
auxiliary supply.
Bell/Siren Terminals "BELL [+]" and "BELL [-]"
These terminals are for powering bells or other devices
requiring a steady output voltage on alarm. The bell output
is fused for 5 amps. When connecting sirens (speakers with
siren driver already built-in), be sure to observe the correct
polarity. Connect the positive lead to the "BELL [+]" terminal
and the negative lead to the "BELL [-]" terminal.
If no siren or bell is used, connect a 1000 ohm resistor
between "BELL [+]" to "BELL [-]". The bell/siren alarm
output is pulsed (1 second on 1 second off) when an alarm
is created by the [F] keypad zone, by the FIRE zone, or
when the Bell Pulse option is enabled in section [18] light 2.
Keypad Terminals "RED", "BLK", "YEL" and "GRN"
Connect the four coloured wires from the keypads to these
terminals. When connecting more than one keypad, connect
in parallel across the keypad terminals at the control panel
(i.e. all reds wires together, all blacks together, all yellows
together and all greens together). The keypad red and black
power supply terminals are fused through the auxiliary fuse.
Programmable Output Terminal "PGM OUT"
The operation of the Programmable Output depends upon
which option is selected in the programming table. See the
"Programming Guide" section [30] for a list of options for the
"PGM OUT" output. The "PGM OUT" is a 50 mA maximum
switch to ground. A 100 ohm current limiting resistor is
connected in series. A small relay, a buzzer or other DC
operated device may be connected between the 12 V
"AUX" (positive) terminal and the "PGM OUT" (switched
negative) terminal on the main board.
Auxiliary Input Terminal "AUX IN" (also KEY ARMING)
The "AUX IN" input terminal is a normally open 24 hour
zone. It can be programmed from the keypad to be silent or
audible. There is no display on the keypad for the "AUX IN"
. 400 mA 12 V
DC DC
input. An alarm on this input is created by applying a
positive voltage or by closing a contact between the "AUX
IN" terminal and the positive auxiliary supply. See
"Programming Guide [ ] [8]" section [11] for programming
the alarm and restoral codes.
The "AUX IN" terminal can also be used as a momentary
key arming/disarming input. See "Programming Guide"
section [30] for a list of options for the "AUX IN" terminal.
"FIRE" Zone Input
The "FIRE" zone is a supervised (normally open alarm
initiating contact) end-of-line resistor circuit designed to
accept "Latching" four-wire smoke detectors.
(See "Fire Circuit Installation Diagram".)
On alarm, (fire zone shorted) the bell output will pulse the
signal to indicate that the fire zone has been activated.
Alarm memory and transmission by the digital
communicator is delayed 30 seconds. If the alarm is
acknowledged, by pressing the [#] key before the 30
second delay has expired the signals will silence and the
transmission will be aborted. If the alarm is not
acknowledged and the 30 second delay expires, the fire
memory latches and the transmission cannot be aborted.
If after signal silence, the smoke detector is not restored to
normal, the signals will resound after 90 seconds, and 30
seconds after that, the communicator will transmit. If the
signals resound, they may again be silenced, [#] key, and
the communicator will be aborted if silence occurs within the
30 second delay period.
To restore the smoke detector to normal, clear all products
of combustion from the detector and reset the detector by
pressing [ ] and then holding down [4] for 2 or 3 seconds.
This action will remove power from the smoke detector and
if it is clear of smoke, the detector will return to normal. If the
detector is still in alarm, the signals will sound immediately
and the above sequence will repeat.
For an open on the FIRE zone, the keypad sounder will beep
twice every 10 seconds and the "Trouble" light will show on
the keypad. The communicator will transmit the trouble
condition if programmed for trouble transmission. The
audible trouble signal may be silenced by pressing the [#]
key. To determine the nature of the trouble, press [ ][2]
(See the "Trouble Display" section).
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